CVE-2026-89566

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89566", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.726Z", "datePublished": "2026-09-11T19:44:36.599Z", "dateUpdated": "2026-10-21T12:47:53.628Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:47:53.628Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\njbd2: check need_resched() when skipping busy checkpoint buffers\n\njournal_shrink_one_cp_list() skips busy checkpoint buffers when called\nwith JBD2_SHRINK_BUSY_SKIP. The continue statement on this path also\nskips the need_resched() check at the end of the loop body.\n\nConsequently, when a checkpoint list contains mostly busy buffers, the\nshrinker can walk the entire list while holding journal->j_list_lock,\neven when a reschedule has been requested. Large checkpoint lists under\nmemory pressure can therefore cause long lock hold times and leave other\nCPUs spinning on j_list_lock, resulting in soft lockups or RCU stalls.\n\nRoute the busy-buffer path through the need_resched() check so that the\nshrinker can release j_list_lock and reschedule promptly, restoring\nparity with the clean-buffer path, which already checks need_resched().\nThis does not change which checkpoint buffers are eligible for removal."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/jbd2/checkpoint.c"], "versions": [{"version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb", "lessThan": "dc7ece0b827fe3b748db685fb85cd2fc3710c3f9", "status": "affected", "versionType": "git"}, {"version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb", "lessThan": "f83c23286e54180cdc83a36463a60003534cc290", "status": "affected", "versionType": "git"}, {"version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb", "lessThan": "f9182a85991a0ad5cd2940df6db75f40ad90028c", "status": "affected", "versionType": "git"}, {"version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb", "lessThan": "595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4", "status": "affected", "versionType": "git"}, {"version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb", "lessThan": "f213e12ff5c9590b1034ae8da0e6d09665c772d0", "status": "affected", "versionType": "git"}, {"version": "9c31bb2684f8035beca0275349d19d679b679ffb", "status": "affected", "versionType": "git"}, {"version": "5fda50e262e65bd553ff777c4b280afd1495a18b", "status": "affected", "versionType": "git"}, {"version": "557fda9ed70ebf8eda2620ba3d746215285a1303", "status": "affected", "versionType": "git"}, {"version": "5.15.129", "lessThan": "5.16", "status": "affected", "versionType": "semver"}, {"version": "6.1.50", "lessThan": "6.2", "status": "affected", "versionType": "semver"}, {"version": "6.4.13", "lessThan": "6.5", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/jbd2/checkpoint.c"], "versions": [{"version": "6.5", "status": "affected"}, {"version": "0", "lessThan": "6.5", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "7.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.129"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4.13"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/dc7ece0b827fe3b748db685fb85cd2fc3710c3f9"}, {"url": "https://git.kernel.org/stable/c/f83c23286e54180cdc83a36463a60003534cc290"}, {"url": "https://git.kernel.org/stable/c/f9182a85991a0ad5cd2940df6db75f40ad90028c"}, {"url": "https://git.kernel.org/stable/c/595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4"}, {"url": "https://git.kernel.org/stable/c/f213e12ff5c9590b1034ae8da0e6d09665c772d0"}], "title": "jbd2: check need_resched() when skipping busy checkpoint buffers", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/jbd2/checkpoint.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "dc7ece0b827fe3b748db685fb85cd2fc3710c3f9", "status": "affected", "version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb", "versionType": "git"}, {"lessThan": "f83c23286e54180cdc83a36463a60003534cc290", "status": "affected", "version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb", "versionType": "git"}, {"lessThan": "f9182a85991a0ad5cd2940df6db75f40ad90028c", "status": "affected", "version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb", "versionType": "git"}, {"lessThan": "595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4", "status": "affected", "version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb", "versionType": "git"}, {"lessThan": "f213e12ff5c9590b1034ae8da0e6d09665c772d0", "status": "affected", "version": "b98dba273a0e47dbfade89c9af73c5b012a4eabb", "versionType": "git"}, {"status": "affected", "version": "9c31bb2684f8035beca0275349d19d679b679ffb", "versionType": "git"}, {"status": "affected", "version": "5fda50e262e65bd553ff777c4b280afd1495a18b", "versionType": "git"}, {"status": "affected", "version": "557fda9ed70ebf8eda2620ba3d746215285a1303", "versionType": "git"}, {"lessThan": "5.16", "status": "affected", "version": "5.15.129", "versionType": "semver"}, {"lessThan": "6.2", "status": "affected", "version": "6.1.50", "versionType": "semver"}, {"lessThan": "6.5", "status": "affected", "version": "6.4.13", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/jbd2/checkpoint.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.5"}, {"lessThan": "6.5", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\njbd2: check need_resched() when skipping busy checkpoint buffers\n\njournal_shrink_one_cp_list() skips busy checkpoint buffers when called\nwith JBD2_SHRINK_BUSY_SKIP. The continue statement on this path also\nskips the need_resched() check at the end of the loop body.\n\nConsequently, when a checkpoint list contains mostly busy buffers, the\nshrinker can walk the entire list while holding journal->j_list_lock,\neven when a reschedule has been requested. Large checkpoint lists under\nmemory pressure can therefore cause long lock hold times and leave other\nCPUs spinning on j_list_lock, resulting in soft lockups or RCU stalls.\n\nRoute the busy-buffer path through the need_resched() check so that the\nshrinker can release j_list_lock and reschedule promptly, restoring\nparity with the clean-buffer path, which already checks need_resched().\nThis does not change which checkpoint buffers are eligible for removal."}], "id": "CVE-2026-89566", "lastModified": "2026-10-21T13:20:08.870", "metrics": {}, "published": "2026-09-11T20:19:40.550", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dc7ece0b827fe3b748db685fb85cd2fc3710c3f9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f213e12ff5c9590b1034ae8da0e6d09665c772d0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f83c23286e54180cdc83a36463a60003534cc290"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f9182a85991a0ad5cd2940df6db75f40ad90028c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel (jbd2): Denial of Service from prolonged lock hold", "id": "2532052", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532052"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-606", "details": ["A flaw was found in the Linux kernel's jbd2 component. When the kernel's journaling block device (jbd2) processes busy checkpoint buffers, it can skip a crucial rescheduling check. This oversight can lead to prolonged holding of a critical lock, causing other central processing units (CPUs) to wait indefinitely. Consequently, this can result in system unresponsiveness, known as soft lockups or RCU stalls, effectively causing a Denial of Service (DoS)."], "name": "CVE-2026-89566", "package_state": [{"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-11T19:44:36Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89566\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89566\nhttps://git.kernel.org/stable/c/595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4\nhttps://git.kernel.org/stable/c/f213e12ff5c9590b1034ae8da0e6d09665c772d0\nhttps://git.kernel.org/stable/c/f83c23286e54180cdc83a36463a60003534cc290\nhttps://git.kernel.org/stable/c/f9182a85991a0ad5cd2940df6db75f40ad90028c"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b98dba273a0e47dbfade89c9af73c5b012a4eabb,f83c23286e54180cdc83a36463a60003534cc290)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b98dba273a0e47dbfade89c9af73c5b012a4eabb,f9182a85991a0ad5cd2940df6db75f40ad90028c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b98dba273a0e47dbfade89c9af73c5b012a4eabb,595cac7f1b32d009b97f83dd2b2d6a1a445e9bb4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b98dba273a0e47dbfade89c9af73c5b012a4eabb,f213e12ff5c9590b1034ae8da0e6d09665c772d0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "9c31bb2684f8035beca0275349d19d679b679ffb"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "5fda50e262e65bd553ff777c4b280afd1495a18b"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "557fda9ed70ebf8eda2620ba3d746215285a1303"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.15.129,5.16.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.50,6.2.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.4.13,6.5.0)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.5"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.5)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.109,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T04:30:07.740884+00:00", "updated": "2026-09-15T22:00:17.600262+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}